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In theory, there is no difference between theory and practice. But, in practice, there is.
--
Jan L. A. van de Snepscheut as quoted by Doug Rosenberg and Matt Stephens (2007) Use Case Driven Object Modeling with UMLTheory and Practice p. xxvii; the quote is also cited without attribution in Doug Rosenberg and Kendall Scott (2001) Applying Use Case Driven Object Modeling With UML, p. 1
--
This quote has also been attributed to Yogi Berra, to Chuck Reid, to William T. Harbaugh, and to Karl Marx

 

Jan L. A. van de Snepscheut

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At the center of the discussion of the nature of practical theology is the issue of the relation of theory to praxis. If theory precedes and determines practice, then practice tends to be concerned primarily with methods, techniques and strategies for ministry, lacking theological substance. If practice takes priority over theory, ministry tends to be based on pragmatic results rather than prophetic revelation … Barth, from the beginning, resisted all attempts to portray theory and praxis in opposition to one another. In his early Church Dogmatics he described any distinction between “theoretical” and “practical” as a “primal lie, which has to be resisted in principal”. The understanding of Christ as the light of life can be understood only as a “theory which has its origin and goal in praxis”.

 

Karl Barth

 

"In sum: banking theory and practice, as immobilizing and fixating forces, fail to acknowledge men and women as historical beings; problem-posing theory and practice take the people's historicity as their starting point."

 

Paulo Freire

 

In war, theory is all right so far as general principles are concerned; but in reducing general principles to practice there will always be danger. Theory and practice are the axis about which the sphere of accomplishment revolves.

 

Napoleon Bonaparte

 

Pornography is the theory, and rape is the practice. And what a practice. The violation of an individual woman is the metaphor for man's forcing himself on whole nations [...], on nonhuman creatures [...], and on the planet itself [...].

 

Robin Morgan

 

Theory and practice sometimes clash. And when that happens, theory loses. Every single time.

 

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